'64 C60 with the 15k lb Chevrolet two speed vacuum rear axle (with the 15x4 brake shoes). Everything I reference notes that the axle is the same from '60 thru roughly '72 on the trucks so it shouldn't be model year specific.
I pulled the yoke and oil seal retainer housing from the axle to replace the pinion oil seal and pulled the main cover to drain the diff and clean and replace fluids. Both had a cork gasket. None of my books show a part number and the local NAPA looked at me cross-eyed when I asked about them. Is the gasket necessary or will some liquid gasket maker cut it? The way the yoke is torqued to the pinion shaft I cant imagine the absence of a 2-4mm gasket messing with bearing preload or oil seal.
Additionally, the manual calls for a 'felt washer' to be present between the oil seal housing and the oil seal itself (see attached photo). There was most definently not one present when I took it apart and the part number on the old seal matches factory numbers which was only run from 64-66. By my guess, I am the first person to have this pinion apart based on what I am seeing, thus I assume the washer was omitted at the factory? Any thought on trying to source one or running without it?
And for anyone that searches and comes across this thread, here's some useful info: PN: 3826129 is the original OEM pinion seal for this axle from '64-'66 PN: 3879527 replaced 3826129 in '66 as the OEM pinion seal
PN: 411330N is the NATIONAL pinion seal that interchanges with both above OEM seals and is available new PN: 25970 is the SKF pinion seal that interchanges with both above OEM seals and is available new PN: 411330N is the TIMKEN pinion seal that interchanges with both above OEM seals and is available new
